Bus Stop Variables have two uses:
Share information between channels on an OT bus stop (not between different bus stops).
Store information from a message and retrieve it later for another message.
They are defined in one place for all OT bus stops but each bus stop has its own instance of each Bus Stop Variable.
Bus Stop Variables can survive a bus stop restart.
Within a channel message Bus Stop Variables can be used as the source or the destination of a tag. They can also be used as the source and the destination together to copy the value of one variable to another.
Bus Stop Variables are supported in both directions (upload/download).
As soon as a Bus Stop Variable has a value it can be used on another channel as the source of another tag. Also, if the same variable is used as a destination in multiple tags then the value written by one tag can be overwritten by the value written by another tag.
In the Bus Stop Monitor Bus Stop Variables are listed at the top of the bus stop tree. Selecting a variable will display its current value.
Before we start using Bus Stop Variables we need to define them.
Select the OT Bus Stops tab.
Click Bus Stop Variables.
A window listing all the existing variables opens.
Click Add.
A dialog opens.
Enter a Name for the variable and Descriptions in all the required languages.
Select a Data Type. (e.g. Boolean, integer).
Click Save.
The variables are configured on the tag window dialog which can be accessed as follows:
Select the OT Bus Stops tab.
Select the required communication channel type (e.g. OPC Client).
A window listing all the existing channels opens.
Create or edit a channel.
The channel editing dialog opens.
Select the Channel Messages tab.
Create or edit a channel message.
The channel message editing dialog opens.
Add or edit a tag.
The tag editing dialog opens.
In the Data source drop-down list of the source or destination select Bus stop variable.
Select a Bus Stop variable from the drop-down list.
Fill in the rest of the tag information and click OK.
Administrators can monitor the values of Bus Stop Variables using ATS Bus Monitor.
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